Hello, I am trying to calculate the internal CPU temperature on an STM32H743, When reading the internal CPU temperature sensor using ADC3 IN18 (internal temperature), I get a very high value (~731C)
The formula I'm using is the following :
Temperature (in °C) = (110 °C – 30 °C) / (TS_CAL2 – TS_CAL1) * (TS_DATA – TS_CAL1) + 30 °C
Here is the algorithm to read the temp :
- Initialise ADC3
- Calibrate ADC3
- ADC3 Start DMA "Reading ADC3 values via DMA, Temperature sensor values are inside ADC_CHANNEL_TEMPSENSOR rank 11"
- Start TIM6 (PSC = 10, ARR=59999) for the sampling frequency of the ADC3, and the samplingTime is 810.5
- Calculate TS_CAL1, TS_CAL2
- Convert ADC value to C°
Here is the code :
MX_ADC3_Init();
HAL_ADCEx_Calibration_Start(&hadc3,ADC_CALIB_OFFSET_LINEARITY, ADC_SINGLE_ENDED);
HAL_ADC_Start_DMA(&hadc3, (uint32_t *)&DMABuff[0], 11);
HAL_TIM_Base_Start_IT(&htim6);
const uint16_t* ADC_TEMP_3V3_30C = (uint16_t*)(0x1FF1E820);
const uint16_t* ADC_TEMP_3V3_110C = (uint16_t*)(0x1FF1E840);
float adcCalTemp30C = (float) (*ADC_TEMP_3V3_30C);
float adcCalTemp110C = (float) (*ADC_TEMP_3V3_110C);
float32_t Temperature = (110 – 30 ) / (adcCalTemp110C – adcCalTemp30C ) * (DMABuff[10] – adcCalTemp30C ) + 30;
I don't know if I missed something that has to be included?
Kind regards
Anas,
